Utility knife



FIG. 1 is a rear perspective view of the utility knife showing my new design;

FIG. 2 is a front perspective view thereof;

FIG. 3 is a bottom perspective view thereof;

FIG. 4 is a top perspective view thereof;

FIG. 5 is a right side perspective view thereof; and,

FIG. 6 is a left side perspective view thereof. 

The ornamental design for a utility knife, as shown and described. 